EP 4290085 A1 20231213 - CONSTRUCTION MACHINE
Title (en)
CONSTRUCTION MACHINE
Title (de)
BAUMASCHINE
Title (fr)
ENGIN DE CHANTIER
Publication
Application
Priority
- JP 2021141560 A 20210831
- JP 2022032866 W 20220831
Abstract (en)
A construction machine including a solenoid valve that reduces a boom lowering pilot pressure for a second directional control valve and a controller that controls the solenoid valve is provided. The controller computes a first opening degree command value in such a manner that a communication area between a boom lowering pressure reducing valve and a pressure receiving chamber of the second directional control valve decreases in association with a bottom pressure of a boom cylinder, computes a second opening degree command value in such a manner that the communication area increases in association with increase in a boom lowering operation amount, decides a minimum opening degree command value as an opening degree command value of the solenoid valve when an elapsed time after boom raising operation is shorter than a set time and decides a minimum selected value of the first and second opening degree command values as the opening degree command value of the solenoid valve when the elapsed time is equal to or longer than the set time, and outputs a command signal according to the decided opening degree command value to the solenoid valve.
IPC 8 full level
F15B 11/08 (2006.01); E02F 9/22 (2006.01); F15B 11/02 (2006.01); F15B 11/028 (2006.01)
CPC (source: EP KR US)
E02F 3/32 (2013.01 - US); E02F 3/425 (2013.01 - US); E02F 3/435 (2013.01 - US); E02F 9/2221 (2013.01 - KR); E02F 9/2242 (2013.01 - EP); E02F 9/2285 (2013.01 - EP); E02F 9/2292 (2013.01 - EP); E02F 9/2296 (2013.01 - EP); F15B 11/028 (2013.01 - KR); F15B 11/08 (2013.01 - KR); B60Y 2200/412 (2013.01 - KR); E02F 3/435 (2013.01 - EP); F15B 2211/20576 (2013.01 - EP); F15B 2211/30525 (2013.01 - EP); F15B 2211/30565 (2013.01 - EP); F15B 2211/3144 (2013.01 - EP); F15B 2211/329 (2013.01 - EP); F15B 2211/351 (2013.01 - EP); F15B 2211/355 (2013.01 - EP); F15B 2211/6313 (2013.01 - EP); F15B 2211/6346 (2013.01 - EP); F15B 2211/6355 (2013.01 - EP); F15B 2211/665 (2013.01 - EP); F15B 2211/7053 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4290085 A1 20231213; CN 116964337 A 20231027; JP 7455285 B2 20240325; JP WO2023033080 A1 20230309; KR 20230144070 A 20231013; US 2024150995 A1 20240509; WO 2023033080 A1 20230309
DOCDB simple family (application)
EP 22864662 A 20220831; CN 202280019702 A 20220831; JP 2022032866 W 20220831; JP 2023545660 A 20220831; KR 20237030697 A 20220831; US 202218280718 A 20220831